Ios 与NSUserDefaults有关的问题

在ViewController A中：

// ViewDidLoad

self.theArray = // set up my array here with objects

// TableView

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    self.viewControllerTwo = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];

    self.myString = [self.theArray objectAtIndex:indexPath.row];

    [[NSUserDefaults standardUserDefaults] setValue:self.myString forKey:@"stringKey"];
    [[NSUserDefaults standardUserDefaults] synchronize];

    [self.navigationController pushViewController:self.viewControllerTwo animated:YES];
}

// ViewDidLoad

self.aLabel.text = [[NSUserDefaults standardUserDefaults] stringForKey:@"stringKey"];

在ViewController B中：

// ViewDidLoad

self.theArray = // set up my array here with objects

// TableView

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    self.viewControllerTwo = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];

    self.myString = [self.theArray objectAtIndex:indexPath.row];

    [[NSUserDefaults standardUserDefaults] setValue:self.myString forKey:@"stringKey"];
    [[NSUserDefaults standardUserDefaults] synchronize];

    [self.navigationController pushViewController:self.viewControllerTwo animated:YES];
}

// ViewDidLoad

self.aLabel.text = [[NSUserDefaults standardUserDefaults] stringForKey:@"stringKey"];

在我的视图控制器A中，我在

NSUserDefaults

中设置字符串，我可以看到它与我点击的单元格相匹配，但当我按下视图控制器B时，我的标签没有拾取存储在

NSUserDefaults

中的内容

我错过了什么

编辑：

// ViewDidLoad

self.theArray = // set up my array here with objects

// TableView

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    self.viewControllerTwo = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];

    self.myString = [self.theArray objectAtIndex:indexPath.row];

    [[NSUserDefaults standardUserDefaults] setValue:self.myString forKey:@"stringKey"];
    [[NSUserDefaults standardUserDefaults] synchronize];

    [self.navigationController pushViewController:self.viewControllerTwo animated:YES];
}

// ViewDidLoad

self.aLabel.text = [[NSUserDefaults standardUserDefaults] stringForKey:@"stringKey"];

我把它改成这样：

// In FirstViewController

self.viewControllerTwo = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];

self.myString = [self.theArray objectAtIndex:indexPath.row];

self.viewControllerTwo.secondString = self.myString;

[self.navigationController pushViewController:self.viewControllerTwo animated:YES];

// In SecondViewController

self.aLabel.text = self.secondString;

---

1、 确保字符串有效，这意味着它既不是@字符，也不是“白色字符”

---

2、 确保将self.aLabel添加到基本视图中，并且self.aLabel不是nil。

字符串有效，它将获取我设置的值。self.aLabel返回为（null）though@LukeIrvin这就是问题所在。尝试在NSLog中显示，看看它是否出现在日志中。如果出现，则标签中存在问题，而不是userdefaultsI中。我刚让它工作起来。我没有使用NSUserDefaults，而是在SecondViewController中设置一个字符串以匹配FirstViewController中的字符串，然后将标签文本设置为字符串值。